EP2657744B1 - Zoom lens system, interchangeable lens device, and camera system - Google Patents

Zoom lens system, interchangeable lens device, and camera system Download PDF

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Publication number
EP2657744B1
EP2657744B1 EP11850468.7A EP11850468A EP2657744B1 EP 2657744 B1 EP2657744 B1 EP 2657744B1 EP 11850468 A EP11850468 A EP 11850468A EP 2657744 B1 EP2657744 B1 EP 2657744B1
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EP
European Patent Office
Prior art keywords
lens
lens unit
image
zoom lens
zoom
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EP11850468.7A
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German (de)
English (en)
French (fr)
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EP2657744A4 (en
EP2657744A1 (en
Inventor
Takuya Imaoka
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Panasonic Corp
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Panasonic Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1445—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative
    • G02B15/144511—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being negative arranged -+-+
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects

Definitions

  • the present invention relates to zoom lens systems, interchangeable lens apparatuses, and camera systems.
  • the present invention relates to: a compact and lightweight zoom lens system having short overall length of lens system and excellent optical performance, with blur compensation function; and an interchangeable lens apparatus and a camera system each employing the zoom lens system.
  • interchangeable-lens type digital camera systems also referred to simply as “camera systems”, hereinafter
  • Such interchangeable-lens type digital camera systems realize: taking of high-sensitive and high-quality images; high-speed focusing and high-speed image processing after image taking; and easy replacement of an interchangeable lens apparatus in accordance with a desired scene.
  • an interchangeable lens apparatus having a zoom lens system that forms an optical image with variable magnification is popular because it allows free change of focal length without the necessity of lens replacement.
  • Zoom lens systems having excellent optical performance from a wide-angle limit to a telephoto limit have been desired as zoom lens systems to be used in interchangeable lens apparatuses.
  • Various kinds of zoom lens systems each having a negative lens unit located closest to an object side, and a multiple-unit construction have been proposed.
  • Japanese Laid-Open Patent Publication No. 2007-078834 discloses a zoom lens having a four-unit construction of negative, positive, negative, and positive, wherein each lens unit moves such that the interval between the first lens unit and the second lens unit decreases, the interval between the second lens unit and the third lens unit increases, and the interval between the third lens unit and the fourth lens unit decreases, at a telephoto limit in comparison with at a wide-angle limit, wherein the second lens unit has a second-A lens element composed of one positive lens, and a second-B lens element which is composed of a negative lens and a positive lens and which has positive refractive power, wherein the second-A lens element moves in a direction perpendicular to an optical axis, and wherein the ratio of a focal length of the second-A lens element to a focal length of the second lens unit is set within the specific range.
  • Japanese Patent No. 3486532 discloses a zoom lens having a four-unit construction of negative, positive, positive, and positive, or negative, positive, positive, and negative, wherein the first lens unit, the second lens unit, and the third lens unit move on an optical axis, and the fourth lens unit is fixed, during magnification change from a wide-angle limit to a telephoto limit, wherein the third lens unit comprises a cemented lens composed of a negative lens and a positive lens, or a cemented lens composed of a positive lens and a negative lens, wherein the third lens unit moves in a direction nearly perpendicular to an optical axis to perform blur compensation, and wherein the ratio of a spherical aberration coefficient of the first lens unit to a spherical aberration coefficient of the second lens unit is set within the specific range, and the ratio of a spherical aberration coefficient of the third lens unit to the spherical aberration coefficient of the second lens unit is set within the specific range.
  • Japanese Patent No. 3587272 discloses a zoom lens having a two-unit construction of negative and positive, wherein the interval between the first lens unit and the second lens unit varies to perform magnification change, wherein the second lens unit has a second front lens unit having positive refractive power and a second rear lens unit having positive refractive power, wherein each optical axial interval between individual lenses in the second front lens unit does not vary during magnification change and focusing, wherein only the second front lens unit moves to an image side to perform focusing, and wherein an imaging magnification of the second front lens unit at a telephoto limit is set within the specific range, and an imaging magnification of the second front lens unit at a wide-angle limit is set within the specific range.
  • Document US 2010/165480 A1 relates to a zoom lens system comprising a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power.
  • An object of the present invention is to provide: a compact and lightweight zoom lens system having short overall length of lens system and excellent optical performance, with blur compensation function; and an interchangeable lens apparatus and a camera system each employing the zoom lens system.
  • zoom lens system That is, the present invention relates to:
  • an interchangeable lens apparatus comprising:
  • the present invention relates to: a camera system comprising:
  • the present invention provides: a compact and lightweight zoom lens system having short overall length of lens system and excellent optical performance, with blur compensation function; and an interchangeable lens apparatus and a camera system each employing the zoom lens system.
  • Figs. 1 , 5 , 9 , 13 , and 17 are lens arrangement diagrams of zoom lens systems according to Embodiments 1 to 5, respectively, and each of the zoom lens systems is in an infinity in-focus condition.
  • each bent arrow located between part (a) and part (b) indicates a line obtained by connecting the positions of each lens unit respectively at a wide-angle limit, a middle position and a telephoto limit, in order from the top. In the part between the wide-angle limit and the middle position and the part between the middle position and the telephoto limit, the positions are connected simply with a straight line, and hence this line does not indicate actual motion of each lens unit.
  • an arrow imparted to a lens unit indicates focusing from an infinity in-focus condition to a close-object in-focus condition. That is, in Figs. 1 , 5 , 9 , 13 , and 17 , the arrow indicates the moving direction of a third lens unit G3 described later, in focusing from an infinity in-focus condition to a close-object in-focus condition.
  • the arrow indicating focusing is placed beneath each symbol of each lens unit for the convenience sake.
  • the direction along which each lens unit moves in focusing in each zooming condition will be hereinafter described in detail for each embodiment.
  • Each of the zoom lens systems according to Embodiments 1 to 5 in order from the object side to the image side, comprises a first lens unit G1 having negative optical power, a second lens unit G2 having positive optical power, a third lens unit G3 having negative optical power, and a fourth lens unit G4 having positive optical power.
  • the first lens unit G1, the second lens unit G2, and the third lens unit G3 individually move in the direction along the optical axis so that the intervals between the respective lens units, i.e., the interval between the first lens unit G1 and the second lens unit G2, the interval between the second lens unit G2 and the third lens unit G3, and the interval between the third lens unit G3 and the fourth lens unit G4, vary.
  • these lens units are arranged in a desired optical power configuration, thereby achieving size reduction of the entire lens system while maintaining high optical performance.
  • an asterisk "*" imparted to a particular surface indicates that the surface is aspheric.
  • symbol (+) or (-) imparted to the symbol of each lens unit corresponds to the sign of the optical power of the lens unit.
  • a straight line located on the most right-hand side indicates the position of an image surface S.
  • an aperture diaphragm A is located between a fourth lens element L4 and a fifth lens element L5 in the second lens unit G2. As shown in Figs. 13 and 17 , an aperture diaphragm A is located between a third lens element L3 and a fourth lens element L4 in the second lens unit G2.
  • the first lens unit G1 in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; a negative meniscus second lens element L2 with the convex surface facing the image side; and a positive meniscus third lens element L3 with the convex surface facing the object side.
  • the first lens element L1 has an aspheric image side surface
  • the second lens element L2 has two aspheric surfaces.
  • the second lens unit G2 in order from the object side to the image side, comprises: a bi-convex fourth lens element L4; a negative meniscus fifth lens element L5 with the convex surface facing the object side; a bi-convex sixth lens element L6; and a bi-convex seventh lens element L7.
  • the fifth lens element L5 and the sixth lens element L6 are cemented with each other.
  • the fourth lens element L4 has two aspheric surfaces. Further, an aperture diaphragm A is located between the fourth lens element L4 and the fifth lens element L5.
  • the fourth lens element L4 and a cemented lens element composed of the fifth lens element L5 and the sixth lens element L6, which are components of the second lens unit G2, correspond to an object-side second lens unit described later.
  • the seventh lens element L7 which is a component of the second lens unit G2 corresponds to an image-side second lens unit described later, which moves in a direction perpendicular to the optical axis in order to optically compensate image blur.
  • the third lens unit G3 comprises solely a negative meniscus eighth lens element L8 with the convex surface facing the object side.
  • the eighth lens element L8 has two aspheric surfaces.
  • the fourth lens unit G4 comprises solely a bi-convex ninth lens element L9.
  • the ninth lens element L9 has two aspheric surfaces.
  • the first lens unit G1 moves with locus of a convex to the image side
  • the second lens unit G2 monotonically moves to the object side
  • the third lens unit G3 monotonically and slightly moves to the object side
  • the fourth lens unit G4 is fixed with respect to the image surface S.
  • the first lens unit G1, the second lens unit G2, and the third lens unit G3 individually move along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 decreases, the interval between the second lens unit G2 and the third lens unit G3 increases, and the interval between the third lens unit G3 and the fourth lens unit G4 varies.
  • the zoom lens system according to Embodiment 1 in focusing from an infinity in-focus condition to a close-object in-focus condition, the third lens unit G3 moves to the image side along the optical axis in any zooming condition.
  • the first lens unit G1 in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; a negative meniscus second lens element L2 with the convex surface facing the image side; and a positive meniscus third lens element L3 with the convex surface facing the object side.
  • each of the first lens element L1 and the third lens element L3 has two aspheric surfaces.
  • the second lens unit G2 in order from the object side to the image side, comprises: a bi-convex fourth lens element L4; a negative meniscus fifth lens element L5 with the convex surface facing the object side; a bi-convex sixth lens element L6; and a bi-convex seventh lens element L7.
  • the fifth lens element L5 and the sixth lens element L6 are cemented with each other.
  • the fourth lens element L4 has two aspheric surfaces. Further, an aperture diaphragm A is located between the fourth lens element L4 and the fifth lens element L5.
  • the fourth lens element L4 and a cemented lens element composed of the fifth lens element L5 and the sixth lens element L6, which are components of the second lens unit G2, correspond to an object-side second lens unit described later.
  • the seventh lens element L7 which is a component of the second lens unit G2 corresponds to an image-side second lens unit described later, which moves in a direction perpendicular to the optical axis in order to optically compensate image blur.
  • the third lens unit G3 comprises solely a bi-concave eighth lens element L8.
  • the eighth lens element L8 has two aspheric surfaces.
  • the fourth lens unit G4 comprises solely a bi-convex ninth lens element L9.
  • the ninth lens element L9 has two aspheric surfaces.
  • the first lens unit G1 moves with locus of a convex to the image side
  • the second lens unit G2 monotonically moves to the object side
  • the third lens unit G3 monotonically and slightly moves to the object side
  • the fourth lens unit G4 is fixed with respect to the image surface S.
  • the first lens unit G1, the second lens unit G2, and the third lens unit G3 individually move along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 decreases, the interval between the second lens unit G2 and the third lens unit G3 increases, and the interval between the third lens unit G3 and the fourth lens unit G4 varies.
  • the zoom lens system according to Embodiment 2 in focusing from an infinity in-focus condition to a close-object in-focus condition, the third lens unit G3 moves to the image side along the optical axis in any zooming condition.
  • the first lens unit G1 in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; a negative meniscus second lens element L2 with the convex surface facing the image side; and a positive meniscus third lens element L3 with the convex surface facing the object side.
  • the second lens element L2 has two aspheric surfaces.
  • the second lens unit G2 in order from the object side to the image side, comprises: a bi-convex fourth lens element L4; a negative meniscus fifth lens element L5 with the convex surface facing the object side; a bi-convex sixth lens element L6; and a bi-convex seventh lens element L7.
  • the fifth lens element L5 and the sixth lens element L6 are cemented with each other.
  • the fourth lens element L4 has two aspheric surfaces. Further, an aperture diaphragm A is located between the fourth lens element L4 and the fifth lens element L5.
  • the fourth lens element L4 and a cemented lens element composed of the fifth lens element L5 and the sixth lens element L6, which are components of the second lens unit G2, correspond to an object-side second lens unit described later.
  • the seventh lens element L7 which is a component of the second lens unit G2 corresponds to an image-side second lens unit described later, which moves in a direction perpendicular to the optical axis in order to optically compensate image blur.
  • the third lens unit G3 comprises solely a bi-concave eighth lens element L8.
  • the eighth lens element L8 has two aspheric surfaces.
  • the fourth lens unit G4 comprises solely a bi-convex ninth lens element L9.
  • the ninth lens element L9 has two aspheric surfaces.
  • the first lens unit G1 moves with locus of a convex to the image side
  • the second lens unit G2 monotonically moves to the object side
  • the third lens unit G3 monotonically and slightly moves to the object side
  • the fourth lens unit G4 is fixed with respect to the image surface S.
  • the first lens unit G1, the second lens unit G2, and the third lens unit G3 individually move along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 decreases, the interval between the second lens unit G2 and the third lens unit G3 increases, and the interval between the third lens unit G3 and the fourth lens unit G4 varies.
  • the zoom lens system according to Embodiment 3 in focusing from an infinity in-focus condition to a close-object in-focus condition, the third lens unit G3 moves to the image side along the optical axis in any zooming condition.
  • the first lens unit G1 in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side.
  • Each of the first lens element L1 and the second lens element L2 has two aspheric surfaces.
  • the second lens unit G2 in order from the object side to the image side, comprises: a bi-convex third lens element L3; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a bi-convex fifth lens element L5; and a bi-concave sixth lens element L6.
  • the fourth lens element L4 and the fifth lens element L5 are cemented with each other.
  • Each of the third lens element L3 and the sixth lens element L6 has two aspheric surfaces.
  • an aperture diaphragm A is located between the third lens element L3 and the fourth lens element L4.
  • the third lens element L3 and a cemented lens element composed of the fourth lens element L4 and the fifth lens element L5, which are components of the second lens unit G2, correspond to an object-side second lens unit described later.
  • the sixth lens element L6 which is a component of the second lens unit G2 corresponds to an image-side second lens unit described later, which moves in a direction perpendicular to the optical axis in order to optically compensate image blur.
  • the third lens unit G3 comprises solely a bi-concave seventh lens element L7.
  • the seventh lens element L7 has two aspheric surfaces.
  • the fourth lens unit G4 comprises solely a bi-convex eighth lens element L8.
  • the eighth lens element L8 has two aspheric surfaces.
  • the first lens unit G1 moves with locus of a convex to the image side
  • the second lens unit G2 monotonically moves to the object side
  • the third lens unit G3 monotonically and slightly moves to the object side
  • the fourth lens unit G4 is fixed with respect to the image surface S.
  • the first lens unit G1, the second lens unit G2, and the third lens unit G3 individually move along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 decreases, the interval between the second lens unit G2 and the third lens unit G3 increases, and the interval between the third lens unit G3 and the fourth lens unit G4 varies.
  • the zoom lens system according to Embodiment 4 in focusing from an infinity in-focus condition to a close-object in-focus condition, the third lens unit G3 moves to the image side along the optical axis in any zooming condition.
  • the first lens unit G1 in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side.
  • Each of the first lens element L1 and the second lens element L2 has two aspheric surfaces.
  • the second lens unit G2 in order from the object side to the image side, comprises: a bi-convex third lens element L3; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a bi-convex fifth lens element L5; a positive meniscus sixth lens element L6 with the convex surface facing the image side; and a bi-concave seventh lens element L7.
  • the fourth lens element L4 and the fifth lens element L5 are cemented with each other
  • the sixth lens element L6 and the seventh lens element L7 are cemented with each other.
  • the third lens element L3 has two aspheric surfaces
  • the sixth lens element L6 has an aspheric object side surface.
  • an aperture diaphragm A is located between the third lens element L3 and the fourth lens element L4.
  • the third lens element L3 and a cemented lens element composed of the fourth lens element L4 and the fifth lens element L5, which are components of the second lens unit G2, correspond to an object-side second lens unit described later.
  • a cemented lens element composed of the sixth lens element L6 and the seventh lens element L7, which are components of the second lens unit G2, corresponds to an image-side second lens unit described later, which moves in a direction perpendicular to the optical axis in order to optically compensate image blur.
  • the third lens unit G3 comprises solely a negative meniscus eighth lens element L8 with the convex surface facing the object side.
  • the eighth lens element L8 has two aspheric surfaces.
  • the fourth lens unit G4 comprises solely a bi-convex ninth lens element L9.
  • the ninth lens element L9 has two aspheric surfaces.
  • the first lens unit G1 moves with locus of a convex to the image side
  • the second lens unit G2 monotonically moves to the object side
  • the third lens unit G3 monotonically and slightly moves to the object side
  • the fourth lens unit G4 is fixed with respect to the image surface S.
  • the first lens unit G1, the second lens unit G2, and the third lens unit G3 individually move along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 decreases, the interval between the second lens unit G2 and the third lens unit G3 increases, and the interval between the third lens unit G3 and the fourth lens unit G4 varies.
  • the zoom lens system according to Embodiment 5 in focusing from an infinity in-focus condition to a close-object in-focus condition, the third lens unit G3 moves to the image side along the optical axis in any zooming condition.
  • the zoom lens systems according to Embodiments 1 to 5 each have a four-unit construction of negative, positive, negative, and positive, in which the second lens unit G2 is composed of two lens units of the object-side second lens unit and the image-side second lens unit. Therefore, the interval between the first lens unit G1 and the second lens unit G2 can be reduced, thereby realizing a reduction in the overall length of lens system, and in addition, realizing a favorable compensation of aberrations at a telephoto limit. Furthermore, during optical compensation of image blur, the amount of movement of the image-side second lens unit in a direction perpendicular to the optical axis can be reduced owing to magnifications of the third lens unit G3 and the fourth lens unit G4.
  • the zoom lens systems according to Embodiments 1 to 5 are each provided with the image-side second lens unit which moves in the direction perpendicular to the optical axis and optically compensates image blur.
  • the image-side second lens unit compensates image point movement caused by vibration of the entire system, that is, optically compensates image blur caused by hand blurring, vibration and the like.
  • the image-side second lens unit moves in the direction perpendicular to the optical axis, so that image blur is compensated in a state that size increase in the entire zoom lens system is suppressed to realize a compact construction and that excellent imaging characteristics such as small decentering coma aberration and small decentering astigmatism are satisfied.
  • the image-side second lens unit may be composed of any one lens element or a plurality of adjacent lens elements.
  • the image-side second lens unit has positive optical power. Therefore, occurrence of coma aberration is reduced during optical compensation of image blur, and each lens surface of lens elements which are components of the image-side second lens unit can be spherical.
  • the third lens unit G3 moves along the optical axis in focusing from an infinity in-focus condition to a close-object in-focus condition, and lens units each having positive optical power, that is, the image-side second lens unit and the fourth lens unit G4 are provided on each of the object side and the image side of the third lens unit G3. Therefore, the negative optical power of the third lens unit G3 itself can be easily increased. Accordingly, the amount of movement of the third lens unit G3 can be reduced in focusing, and thus the overall length of lens system is reduced, and moreover, the overall length of lens system with the lens barrel being retracted is also reduced.
  • a plurality of preferable conditions is set forth for the zoom lens system according to each embodiment.
  • a construction that satisfies all the plural conditions is most desirable for the zoom lens system.
  • a zoom lens system having the corresponding effect is obtained.
  • a zoom lens system like the zoom lens systems according to Embodiments 1 to 5, which comprises, in order from an object side to an image side, a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having negative optical power, and a fourth lens unit having positive optical power, and in which the second lens unit is, in order from the object side to the image side, composed of an object-side second lens unit and an image-side second lens unit, and in which the image-side second lens unit moves in a direction perpendicular to an optical axis to optically compensate image blur (this lens configuration is referred to as a basic configuration of the embodiments, hereinafter), the following condition (1) is satisfied. 1 ⁇
  • the condition (1) sets forth the relationship between the focal length of the image-side second lens unit which optically compensates image blur and the focal length of the entire system at a wide-angle limit.
  • the optical power of the image-side second lens unit becomes excessively strong, and thereby occurrence of aberrations during image blur compensation increases.
  • the value exceeds the upper limit of the condition (1) the amount of movement of the image-side second lens unit increases, and thereby the size of actuators for the image-side second lens unit also increases.
  • the sizes of the zoom lens system and a lens barrel which holds the zoom lens system also increase, and thereby reduction in the sizes of the zoom lens system and the lens barrel cannot be realized.
  • a zoom lens system having the basic configuration like the zoom lens systems according to Embodiments 1 to 5 satisfies the following condition (2). 0.30 ⁇ d 1 / f W ⁇ 0.85 where
  • the condition (2) sets forth the relationship between the thickness of the first lens unit and the focal length of the entire system at a wide-angle limit.
  • the optical power of each lens element constituting the first lens unit cannot be increased, which might cause difficulty in reduction of the overall length of lens system.
  • the value exceeds the upper limit of the condition (2) the overall length of lens system increases, which might cause increase also in the overall length of lens system with the lens barrel being retracted.
  • the individual lens units constituting the zoom lens systems according to Embodiments 1 to 5 are each composed exclusively of refractive type lens elements that deflect incident light by refraction (that is, lens elements of a type in which deflection is achieved at the interface between media having different refractive indices).
  • the present invention is not limited to this construction.
  • the lens units may employ diffractive type lens elements that deflect incident light by diffraction; refractive-diffractive hybrid type lens elements that deflect incident light by a combination of diffraction and refraction; or gradient index type lens elements that deflect incident light by distribution of refractive index in the medium.
  • the refractive-diffractive hybrid type lens element when a diffraction structure is formed in the interface between media having different refractive indices, wavelength dependence of the diffraction efficiency is improved. Thus, such a configuration is preferable.
  • Fig. 21 is a schematic construction diagram of an interchangeable-lens type digital camera system according to Embodiment 6.
  • the interchangeable-lens type digital camera system 100 includes a camera body 101, and an interchangeable lens apparatus 201 which is detachably connected to the camera body 101.
  • the camera body 101 includes: an image sensor 102 which receives an optical image formed by a zoom lens system 202 of the interchangeable lens apparatus 201, and converts the optical image into an electric image signal; a liquid crystal monitor 103 which displays the image signal obtained by the image sensor 102; and a camera mount section 104.
  • the interchangeable lens apparatus 201 includes: a zoom lens system 202 according to any of Embodiments 1 to 5; a lens barrel 203 which holds the zoom lens system 202; and a lens mount section 204 connected to the camera mount section 104 of the camera body 101.
  • the camera mount section 104 and the lens mount section 204 are physically connected to each other.
  • the camera mount section 104 and the lens mount section 204 function as interfaces which allow the camera body 101 and the interchangeable lens apparatus 201 to exchange signals, by electrically connecting a controller (not shown) in the camera body 101 and a controller (not shown) in the interchangeable lens apparatus 201.
  • the zoom lens system according to Embodiment 1 is employed as the zoom lens system 202.
  • Embodiment 6 since the zoom lens system 202 according to any of Embodiments 1 to 5 is employed, a compact interchangeable lens apparatus having excellent imaging performance can be realized at low cost. Moreover, size reduction and cost reduction of the entire camera system 100 according to Embodiment 6 can be achieved. In the zoom lens systems according to Embodiments 1 to 5, the entire zooming range need not be used. That is, in accordance with a desired zooming range, a range where satisfactory optical performance is obtained may exclusively be used. Then, the zoom lens system may be used as one having a lower magnification than the zoom lens systems described in Embodiments 1 to 5.
  • Figs. 2 , 6 , 10 , 14 , and 18 are longitudinal aberration diagrams of an infinity in-focus condition of the zoom lens systems according to Numerical Examples 1 to 5, respectively.
  • Figs. 3 , 7 , 11 , 15 , and 19 are longitudinal aberration diagrams of a close-object in-focus condition of the zoom lens systems according to Numerical Examples 1 to 5, respectively.
  • the object distance in each of Numerical Examples 1 to 5 is 300 mm.
  • each longitudinal aberration diagram shows the aberration at a wide-angle limit
  • part (b) shows the aberration at a middle position
  • part (c) shows the aberration at a telephoto limit.
  • SA spherical aberration
  • AST mm
  • DIS distortion
  • the vertical axis indicates the F-number (in each Fig., indicated as F)
  • the solid line, the short dash line and the long dash line indicate the characteristics to the d-line, the F-line and the C-line, respectively.
  • the vertical axis indicates the image height (in each Fig., indicated as H), and the solid line and the dash line indicate the characteristics to the sagittal plane (in each Fig., indicated as “s”) and the meridional plane (in each Fig., indicated as "m"), respectively.
  • the vertical axis indicates the image height (in each Fig., indicated as H).
  • Figs. 4 , 8 , 12 , 16 , and 20 are lateral aberration diagrams of the zoom lens systems at a telephoto limit according to Numerical Examples 1 to 5, respectively.
  • the aberration diagrams in the upper three parts correspond to a basic state where image blur compensation is not performed at a telephoto limit
  • the aberration diagrams in the lower three parts correspond to an image blur compensation state where the image-side second lens unit
  • Numerical Examples 1 to 3 the seventh lens element L7
  • Numerical Example 4 the sixth lens element L6
  • Numerical Example 5 the cemented lens element composed of the sixth lens element L6 and the seventh lens element L7
  • the upper part shows the lateral aberration at an image point of 70% of the maximum image height
  • the middle part shows the lateral aberration at the axial image point
  • the lower part shows the lateral aberration at an image point of -70% of the maximum image height.
  • the lateral aberration diagrams of an image blur compensation state the upper part shows the lateral aberration at an image point of 70% of the maximum image height
  • the middle part shows the lateral aberration at the axial image point
  • the lower part shows the lateral aberration at an image point of -70% of the maximum image height.
  • the horizontal axis indicates the distance from the principal ray on the pupil surface
  • the solid line, the short dash line and the long dash line indicate the characteristics to the d-line, the F-line and the C-line, respectively.
  • the meridional plane is adopted as the plane containing the optical axis of the first lens unit G1 and the optical axis of the second lens unit G2.
  • the amount of movement of the image-side second lens unit in a direction perpendicular to the optical axis in an image blur compensation state at a telephoto limit is as follows.
  • Numerical Example 10.187 mm Numerical Example 20.309 mm
  • Numerical Example 3 0.309 mm
  • Numerical Example 5 0.469 mm
  • the amount of image decentering in a case that the zoom lens system inclines by 0.3° is equal to the amount of image decentering in a case that the image-side second lens unit displaces in parallel by each of the above-mentioned values in a direction perpendicular to the optical axis.
  • the zoom lens system of Numerical Example 1 corresponds to Embodiment 1 shown in Fig. 1 .
  • Table 1 shows the surface data of the zoom lens system of Numerical Example 1.
  • Table 2 shows the aspherical data.
  • Table 3 shows various data in an infinity in-focus condition.
  • Table 4 shows various data in a close-object in-focus condition.
  • the zoom lens system of Numerical Example 2 corresponds to Embodiment 2 shown in Fig. 5 .
  • Table 5 shows the surface data of the zoom lens system of Numerical Example 2.
  • Table 6 shows the aspherical data.
  • Table 7 shows various data in an infinity in-focus condition.
  • Table 8 shows various data in a close-object in-focus condition.
  • the zoom lens system of Numerical Example 3 corresponds to Embodiment 3 shown in Fig. 9 .
  • Table 9 shows the surface data of the zoom lens system of Numerical Example 3.
  • Table 10 shows the aspherical data.
  • Table 11 shows various data in an infinity in-focus condition.
  • Table 12 shows various data in a close-object in-focus condition.
  • the zoom lens system of Numerical Example 4 corresponds to Embodiment 4 shown in Fig. 13 .
  • Table 13 shows the surface data of the zoom lens system of Numerical Example 4.
  • Table 14 shows the aspherical data.
  • Table 15 shows various data in an infinity in-focus condition.
  • Table 16 shows various data in a close-object in-focus condition.
  • the zoom lens system of Numerical Example 5 corresponds to Embodiment 5 shown in Fig. 17 .
  • Table 17 shows the surface data of the zoom lens system of Numerical Example 5.
  • Table 18 shows the aspherical data.
  • Table 19 shows various data in an infinity in-focus condition.
  • Table 20 shows various data in a close-object in-focus condition.
  • Table 21 shows the corresponding values to the individual conditions in the zoom lens systems of each of Numerical Examples.
  • Table 21 (Values corresponding to conditions) Condition Numerical Example 1 2 3 4 5 (1)
  • the zoom lens system according to the present invention is applicable to a digital still camera, a digital video camera, a camera for a mobile telephone, a camera for a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera, a vehicle-mounted camera or the like.
  • the zoom lens system according to the present invention is suitable for a photographing optical system where high image quality is required like in a digital still camera system or a digital video camera system.
  • the zoom lens system according to the present invention is applicable to, among the interchangeable lens apparatuses according to the present invention, an interchangeable lens apparatus having motorized zoom function, i.e., activating function for the zoom lens system by a motor, with which a digital video camera system is provided.
  • motorized zoom function i.e., activating function for the zoom lens system by a motor, with which a digital video camera system is provided.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)
  • Adjustment Of Camera Lenses (AREA)
EP11850468.7A 2010-12-22 2011-12-14 Zoom lens system, interchangeable lens device, and camera system Active EP2657744B1 (en)

Applications Claiming Priority (2)

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JP2010286697 2010-12-22
PCT/JP2011/006966 WO2012086153A1 (ja) 2010-12-22 2011-12-14 ズームレンズ系、交換レンズ装置及びカメラシステム

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EP2657744A1 EP2657744A1 (en) 2013-10-30
EP2657744A4 EP2657744A4 (en) 2017-11-29
EP2657744B1 true EP2657744B1 (en) 2019-03-20

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EP (1) EP2657744B1 (zh)
JP (1) JP5816845B2 (zh)
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JP5832271B2 (ja) 2011-12-21 2015-12-16 キヤノン株式会社 ズームレンズ及びそれを有する撮像装置
JP6098863B2 (ja) * 2012-08-30 2017-03-22 株式会社ニコン 変倍光学系、この変倍光学系を有する光学装置、及び、変倍光学系の製造方法
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JP6251947B2 (ja) * 2012-08-30 2017-12-27 株式会社ニコン 変倍光学系、この変倍光学系を有する光学装置、及び、変倍光学系の製造方法
JP6091868B2 (ja) * 2012-12-04 2017-03-08 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． ズームレンズ
WO2015016031A1 (ja) * 2013-08-02 2015-02-05 株式会社ニコン ズームレンズ、光学装置、ズームレンズの製造方法
JP6268792B2 (ja) * 2013-08-02 2018-01-31 株式会社ニコン ズームレンズ、光学装置、ズームレンズの製造方法
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JP6241142B2 (ja) * 2013-08-29 2017-12-06 株式会社ニコン 変倍光学系、光学装置、及び変倍光学系の製造方法
JP6241141B2 (ja) * 2013-08-29 2017-12-06 株式会社ニコン 変倍光学系、光学装置、及び変倍光学系の製造方法
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CN103038687A (zh) 2013-04-10
US8873145B2 (en) 2014-10-28
JP5816845B2 (ja) 2015-11-18
EP2657744A4 (en) 2017-11-29
EP2657744A1 (en) 2013-10-30
US20130141616A1 (en) 2013-06-06
CN103038687B (zh) 2015-06-17
JPWO2012086153A1 (ja) 2014-05-22
WO2012086153A1 (ja) 2012-06-28

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